Typewriting machine



April 22, 1930- l A. G. F. KURowsKl 1,755,183

TYPEWRITING MACHINE Filed Nov. 14, 1927 xii-fj?- by M., Afm

Patented Apr. 22, 1939 UNITED sur .PATENT Ferca 'ALFREDGI FL .xunowsxrl or BROOKLYN,Y v:anw Yoan* Assreivon 'Tol Unnnnwoon c, Ennrorr. rtsi-1ERI CQMPANY, or' NBWYOMLNJY., A conronnrron Loaimnavvarmk i TYPE-:Wartime MACHINE Applicatien filed Novemberlff 192'?,A `Serial No, 233,030. I

This invention:k relates to an Vattachment for typewrting machines designed to increase its manifolding power at will. f

The attachment substantially includes a ilat'impression lstrip of relatively hard mart-e-v rial snugly held against` v the conventional rubber platen along the printing line. The strip is stationary relatively to the rotating platen, and furnishes -a suitablel backing for an extra large number of carbon-copies. "A feature of the invention'. isthe mounting of the strip' in sucha way that the'same .may be quickly calledfinto use or removed.

In one form of the invention, the platen-V strip or auxiliary yplaten forms the cross-bar of a bail or swing-framewhich ismounted uponthe platen-frame forsw'inging move# ment in a plane at right angles to the platenf axis. The 'platenfstrip, "therefore,y may be swung from forward operative to rrearward inoperative i position, and ysuitable 4l( spring) means may be provided to detain 'lathe same in either place. ,t

The preferredembodiment ofthe* invention, shown-to be applied toy thepl'aten-car.- riage of astandardfUnderw'ood machine,

employs a rigid swingframe extending substantially the length of the platen and bearing thereagainst, and pivoted at either ,side` upon the'sideplatesof thewe'llknown Un derwood platen-frame The swingframe, normally in horizontal position, hz'isfaty 'its' forward end angularlydisposed thereonfixe'd'y arms extending downwardly towards the typing line adj acent; theends thereof, which armsin turn hold thevfmanifold platen-strip uponVv the. platen; The yistrip is preferably made of thin flexible spring metal which has l a natural set'inthel form of Ya slight'fbulging towards the vplaten from end Vto end, so 'that the strip, whichin cross-section also conforms" to the curvature of the; platen, will assume unifOrmbearing against .the 'platen-surface'- upon engagement therewith. VVhenthefhard platen-surfaceA is not desired,`it is swung awayv from they .platen so as not to impedethe Y action thereof)` The auxiliary platen, morever, has a vsmooth -rearface, which, when in' jus'e',.bears against the platen, but does not preventthe properz stepbyjstep rotation @of 'inafterVV appear.

the platen; A compressionspringis provided at either side ofthe swing-frame.` 'The springs are enclosed in telescopically co-op-L erat'ing tubermembers, their arrangement be-v l operative position.

.Azfurther feature of the present invention resides in the arrangement of the overthrow device for co-operation-with the swing-frame, f

so as te "urge'vthe auxiliaryplaten lightlyagainst the main rotary platen',thus assuring affirm contactwith the latter, which will give better typing. impressions f and makes for' quieter operation ofthe machine 'by lp'revt-Sntu ingA chattering of the auxiliary, platen-strip;

lOther .featur'esand advantages willheref In thelacco'mpanying drawings,

'.Figu're 1 is a part-sectionaltop view upon a platen-and"platen=frame, showingtthe auxiliaryl platen-strip spring-'held operative position. i

Figure 2 isa cross-sectional "elevation taken upon ,Figure l, and showing the auxiliary L platen-strip in forward operative-and rear-v wardinoperative' positions (the latter indicated in dot and dash).

"Figure 3 is 'a perspective kvie-w, substantially showing the parts of Figures 1 and 2, andv more clearly showing the novel organization of the lauxiliary*platen-strip; f J Figure 4 shows, broken away, the front part Vof Jche strip-carrying spring-bail, the strip being shown las lbeing bulged towards theplaten from end to'end, to causethe strip platen. @"1 Y :-A.revoluble platen 10 ofan Underwood typewriter is journaled: in the side platesy 111 of a usual platen-frame by means of a platen? shaft;` 12, which terminates in `usualwplatenknobs or finger-wheels 13. The-platen-frame Y -to evenly bear throughout its length'uponv the rigidly interconnects' said :side lates. "A i packet worksheets-'15 interleave `with car'T tiene jef-is .shownifn E'gure as' being fed around the platen by means of pressure feedwhere a usual type-bar 18 indicates the printing. A little distance. beyond the typing line, the paper is heldupon the platen by a releasable roller 19, which is carried by an arm 20, partly shown, and which, as known from the Underwood machine, is usually resiliently mounted upon the platen-frame. A blade or strip 21 is stationarily and displaceably held against the platen at thetyping line, to serve as a hard working face for the blows of the type-bars, replacing the ordinary rubber face of the platen, when airelatively large number of carbon-copies is to be accommodated. `The displaceable platen-strip forms part of a novel organization constituting a swing-frame or bail-member c 22,

i which, byv means of `brackets 23, is mounted upon the platen-frame and allows the platenstrip to-be readilyV placed in operative or out of the way (inoperative) position. Each of said brackets 23 includes a fiat body-member 24 fixedv upon flanges l25 forming the Vtop of the side Aplates V11 by means of screws 26,1and which body-members have struck-up ears 27 upon whichV are rigidly fixed pivots 28 to receive the swing-frame or bail-member 22. Each pivot 28 has a reduced end 29 which passesthrough an opening inone of said ears 27, the projecting tip of said reduced end being riveted over upon the ear soV as to rigidly anchor the'pivot thereon. The swing-frame or bail-member 22 includes side arms 30 hav-A ing hubs 31 which tit over said pivots and which are secured thereon by the heads 32 of screws 33, which are centrally threaded into Y thefree ends of saidpivots. rllhe side armsV at their forward ends (see Figure 3) have sidewardly and `inwardly bent-over parts 34, which, by means of a flat cross-bar 35 and screws 36, are interconnected to Vcreatea Y rigid frame, said bent-over parts further in Y curvature of the platen.

each case having a depending arm 37 offset from theside arm 3O1to clear theside plate 11and rising curved projections 37 a to serve as finger-pieces in operating the swing-frame. The depending arms 37 extend asfar as the typing line `and support, fastened thereto by screws v38, said platen-strip 21-proper, whichV is shown in cross-section to conform to the The platen-strip is preferably made of spring-material and formed with a slight bow or natural set towards the platen from end to end so as to as- Y sume; uniform bearing upon the platen-surface when engaged therewith. l

Inforder to hold the strip or'blade 21 in Y close relationwith the platen, there are pro- The parts 39 of the links are Vcrossbar 35 of the bail-member 22. Within the hollow interior of each of the links, there is provided a compression-spring 42 which normally tends to force the halves of the links away from each other, thus snugly forcing said strip 21 against the platen without, however, unduly braking the same, or interfering With insertion of the work-sheets. platen-strip 21 is held in operative position along the typing line, as shown in Figure 2, it serves as a suitable backingfor the abovementioned pack of Vwork-sheets and interleaved carbons, in; that the imprint of the type-bar 18 will more clearly and distinctly reach the, lowermost work-sheet, whileV the paper-pack, in itself, 'offers suiicient cushioning to the blow. 1When aplain work-sheet or a few copies only are to be written, which do not oiferany suliicient cushioning effect tothe blows ofthe type-bars, the platen-strip 21 will be displaced by swinging the bail backwardly (see Figure 2) into. dot-and-dash position, where it is equally held in place by the overthrow action of said compression-springs 42, thus exposingthe'surface of the usual hard rubber platen 10 directly as a cushion to the When the Y presentarrangement Vof the platen-strip al-V lows the operator to quickly engage the same against the` platen orto displace it, when not to be used, to a location not interfering with the general operation of the machine, and also over prior detachable devices, eliminates the possibilities of mislaying or losing, the same.

i Variations may be resorted tovwithin the scope ofthe invention, and'portions of the improvements may be used without others. Having thus described my invention, I

claim Ythe length ofthe rotary platen and trans-V versely conforming to its curvature, supporting members at the ends of/said auxiliary platen for holding it in place stationary relatively to therota'ry platen, said supporting members Vpivoted upon the platen-frame to-allow the auxiliary platen to be swung to Y operative or inoperative position, a'bar rigidly interconnecting said supporting members intermediately of said auxiliary platen and the pivot-axis of said supporting members so as to create a rigid frame-structure which positively" locates the VauxiliaryV platen uponthe' rotary platen, andmeans to resiliently holdthe'auxiliary platen in either position.

y52,.v In a typewriting yn'iachine having a lrotary platen journaled in a platen-frame, Vthe combinat-ion of an impression-strip of harder material set against the rotary platen longitudinally thereofat the typing line and substantially extending the length of the rotary platen, a horizontal frame or bail ofV fiat material pivoted at the rearupon the sides yof the platen-frame, depending flat arms extending from said baily at either side thereof to adjacent the typing line and carry- V ing rigidly fastened thereon said strip, the soformed angular ,frame-structure swingable from forward operative to rearward inoperative position, stops to limit the rearward' throw of the bail,fand spring-thrust means to resiliently hold the same in either position.

3. In ya typewriting machine having a rotary yplaten journaled in a platen-framethe combination of an impression-strip of hardery vmaterial set against .the rotary platen longiftudinally thereof at the typing line and substantially' extending the length of the rotary platen, a horizontal frameY or bail of yfiat material pivoted at the rear upon the sides of the platen-frame,- dependingflat arms eX- l tending .from said bail at either side thereof tachment including a frame-structure eX- tending Afrom side to side ofthe platen-frame,

brackets mount-ed upon the sides of the platen-frame to carry pivoted thereon said frame-structure which forms the support for said strip, and, in its forward operative position, locates the same to contactthe Vrotary platen at the typing line, said frame-structure swingable to rearward inoperative position to displace the strip, stops to determine the rearward throw ofthe frame-structure,` and spring-thrust means in the form of overthrow springs between the brackets andthe sides of the frame-'structure to resilientlyf.

hold the frame-'structure inoperative or 1n-V operative position. v f ,y i 'l v ALFRED G. F.KUROWSKI;

to adjacentthe typingline and carrying y' rigidly fastened thereon said strip, the'soformed angular frame-structure swingable l from forward operativev to rearward inoperatary platen journaled in a platen-frame, the e combination ofan impression-strip of harder f material set against the rotary platenlongitudinally thereof at the typing line and substantially extending the length of the, rotary platen, a horizontal frame or bail of flat material pivoted Yat therear upon theA sides of the platen-frame, dependingv flat rarms eX- 'tending from said bail ateither sidethereof to adjacent the typing line and carrying rigidly fastened'thereon'said strip, the so- .formed angular frame-structure swingable y from forward operative to rearward inoperyand the correspondin'gside vorf the'y platenative position7 stops upon the platen-frame ,f

' to limit the rearward throw of the bail, and

spring-thrust means to resiliently hold the frame-structure in either position, said means including compression-springs between each side arm of the respective sides of the platenframe, said springs being enclosed in telescopically co-operating thrust-members.

5. In a type'writing machine havinga rotary platen journaled in the side plates ofa platen-frame, vdisplaceable impressionstrip intheform of an attachment, -said'at-y la@v 

